package com.example.demo;

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.env.Environment;

import java.util.Objects;

@SuppressWarnings("unused")
class CustomCommandLineRunner implements CommandLineRunner {

    Environment env;

    //注入Environment
    public CustomCommandLineRunner( Environment env ){
        this.env=env;
    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println("利用spring boot自动装配的CommandLineRunner。");

        System.out.println("生成一个随机字符串：".concat(Objects.requireNonNull(env.getProperty("random."))));

    }
}
